The following maintenance schedule is quoted directly from the Wilson Combat 1911 Auto Maintenance Manual by Bill Wilson. Clean and Lube, Routine: Lead bullet use every 300-500 rounds Jacketed bullet use every 500-700 rounds Carry pistols once a month Clean and Lube, Thorough: Every 5,000 rounds and/or every 3 months your pistol should be completely disassembled, cleaned and lubricated. Spring Replacement: Recoil spring every 2,000 rounds Firing pin spring every 5,000 rounds Hammer spring every 25,000 rounds Parts Replacement: Firing pin stop: when cracked Slide stop: when broken Extractor: when hook edges become worn or fails to maintain tension Credit to the Sight M1911 http://www.sightm1911.com/